Spring MVC logging controller information with MDC.

MdcLoggingInterceptor.java

@Slf4j
public class MdcLoggingInterceptor implements HandlerInterceptor {

    public static final String REQUEST_URL_MDC_KEY = "URL";
    public static final String REQUEST_CONTROLLER_MDC_KEY = "Controller";

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        if (handler instanceof HandlerMethod) {
            String fullUrl = request.getRequestURI() + Optional.ofNullable(request.getQueryString()).map(qs -> "?" + qs).orElse("");
            HandlerMethod handlerMethod = (HandlerMethod) handler;
            String controllerInfo = handlerMethod.getBeanType().getSimpleName() + "#" + handlerMethod.getMethod().getName();

            log.debug("Request URL: {} Controller: {}", fullUrl, controllerInfo);

            MDC.put(REQUEST_URL_MDC_KEY, fullUrl);
            MDC.put(REQUEST_CONTROLLER_MDC_KEY, controllerInfo);
            MDC.put("URL_PATTERN", String.valueOf(request.getAttribute(HandlerMapping.BEST_MATCHING_PATTERN_ATTRIBUTE))); // /url/pattern/{path_var}

        }

        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        MDC.clear();
    }
}

/*
public void addInterceptors(InterceptorRegistry registry) {
    registry.addInterceptor(new MdcLoggingInterceptor()).addPathPatterns("/**");
}
*/